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**1. Homework Statement**

I am finding the minimum coefficient μ between tires and road so that cars do not slide off. I have my equations for ƩF

_{y}and ƩF

_{x}and I know μ = [f

_{s}]/[/N]

So I would need to use cramer's rule on my equations to find f

_{s}and N.

But I am not sure how to use cramer's rule for my equations.

**2. Homework Equations**

ƩF

_{x}= Nsinθ -f

_{s}cosθ = mv

^{2}/r

ƩF

_{y}= Ncosθ + f

_{s}sinθ = mg

**3. The Attempt at a Solution**

I actually already have the answer but im not sure how to use cramer's to get to it.

f

_{s}= m(gsinθ-v

^{2}/r*cosθ)

N = m(v

^{2}/r*sinθ+gcosθ)